By year's end there will be at least one fewer entry in the ultracompetitive composite decking industry. GAF Materials Corp. plans to cease manufacturing and close its composite decking manufacturing facilities in Lenexa, Kan., and Biddeford, Maine. The closures will mark the end of GAF's four-year foray into the composite decking business.

The company will continue to honor warranties for its products and will sell out the products it has already produced. The company said it is getting out of the industry because it is not getting the financial return it sought. GAF hasn't determined whether it will sell the composite decking brand names.

GAF became involved with composite decking in 2007 following its purchase of ElkCorp and its Elk Cross Timbers line of decking. In 2009, GAF purchased Correct Building Products and acquired its CorrectDeck CX line. The company currently markets its decking under the DuraLife brand, which includes railings and products made for docks and porches.

GAF is best known for manufacturing shingles and other roofing products, and it appears to be increasing its investment in that area. On Sept. 20, the company announced it will open two new roofing insulation plants, one in Statesboro, Ga., which is set to open in the middle of 2012, and another in either Texas or Oklahoma, which would be operational by the end of 2012.